Enrique Iglesias has shared the first picture of one of his twins

Captioning the picture, Enrique simply wrote: "My Sunshine (sic)"

Enrique has kept his personal life - including his relationship with Anna - out of the spotlight for many years and he previously admitted he doesn't think "perfect relationships" exist as there can be "bad times" between every couple.

He shared: "You go through your good times, you go through your bad times. It's a tough thing for me to believe there's such a thing as the perfect relationship. I don't think that exists."

And Enrique couldn't help but gush about Anna, who he says is the "coolest girl in the world".

He said: "Firstly, she's the coolest girl in the world. And she understands who I am, to the point where she's willing to sacrifice her personal time with me and let me do my music. It's a huge sacrifice and I respect that tremendously."

And the 42-year-old singer previously claimed he and Anna already live the life of a married couple in many ways.

He explained: "We're just as happy. There comes a point when you've been with someone for a certain amount of time that I believe that you are like, married. I guess the only difference is that we haven't walked down the aisle."